KR20040072576A - A fluid dynamic bearing motor having a cone bearing - Google Patents

Abstract

PURPOSE: A fluid dynamic bearing motor is provided to reduce the size of the motor and effectively prevent vibrations by using a cone bearing. CONSTITUTION: A fluid dynamic bearing motor comprises a fixed member, and a rotatable member supported by a bearing support member using a fluid dynamic pressure. The bearing support member is a cone bearing(310) for supporting the rotatable member simultaneously in a rotating direction and the direction perpendicular to a rotating shaft. The fixed member includes a housing(110) having a hole, a rib(111), and a core(130) arranged at the outer surface of the rib; a sleeve(120) coupled to the hole of the housing, and which has a through hole and an accommodating groove(123); and a cover plate(180) coupled to the bottom of the through hole of the sleeve. The rotatable member includes a shaft(140) having a flange coupled to the accommodating groove of the sleeve; a cover block(190) coupled to the top of the shaft, and which has a conical outer surface(191) corresponding to a conical inner surface(121) of the sleeve; and a hub(150) having a center connected to the cover block, and a magnet(160) for generating electromagnetic forces through the cooperation with the core.

Description

A fluid dynamic bearing motor having a cone bearing

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid dynamic bearing spindle motor employing a truncated conical bearing. In particular, the present invention relates to suppressing conical vibration in spite of miniaturization, thereby improving driving characteristics of the motor. The present invention relates to a hydrodynamic bearing motor employing a truncated conical beary with improved impact resistance.

In general, motors employing ball bearings have friction with the shaft, which causes noise and vibration. The vibration generated at this time is called NRRO (Non Repeatable Run Out). This vibration acts as an obstacle to increasing the track density of the hard disk.

On the other hand, the fluid dynamic bearing which maintains the motor shaft by the centrifugal force of the lubricating oil only has no metal friction because it is based on the centrifugal force. The high speed rotation of the disk is also better suited to smoother and higher end hard disk products than ball bearings.

Conventional hydrodynamic bearings in spindle motors typically have herringbone or spiral hydrodynamic pressure generating grooves on the inner surface of the sleeve or on the mating surface of the thrust plate, respectively. The groove is formed, and oil is filled into the bearing clearance formed finely between the shaft and the sleeve or the thrust plate and the sleeve, so that dynamic pressure is generated between the friction members in the bearing clearance. The frictional load is reduced by making non-contact with each other.

An example of a motor employing such a hydrodynamic bearing is shown in FIG. 1.

It consists of a fixing member consisting of the housing 10, the sleeve 20 and the core 30, and a rotating member composed of the shaft 40, the hub 50 and the magnet 60.

The sleeve 20 is formed in a hollow shape so that the shaft 40 is rotatably inserted, and a groove (not shown) for generating dynamic pressure is formed on the inner diameter surface thereof so that the fluid dynamic pressure in the radial direction of the shaft 40 can be obtained. Generates.

In addition, an annular thrust plate 70 is fixedly coupled to the lower end of the shaft 40 so as to be rotatable with the shaft 40 at the inner diameter of the sleeve 20, and at the inner center of the housing 10. The core 30 on which the coil is wound is fixedly mounted.

The thrust plate 70 is formed so that the fluid dynamic pressure in the axial direction is formed by the groove (not shown) for generating the dynamic pressure on the upper surface and the lower surface.

On the other hand, the lower end of the sleeve 20, the inner diameter is shielded by the cover plate 80 is blocked from the outside, the thrust plate 70 is rotated relative to the upper side of the cover plate (80).

In addition, a hub 50 is integrally coupled to an upper end of the shaft 40 rotatably inserted into an inner diameter portion of the sleeve 20, and the hub 50 has an inner diameter of an extended end portion as a cap shape opened downward. The magnet 60 is installed on the surface to face the outer diameter surface of the core 30.

In such a structure, a fine oil gap is formed between the inner diameter surface of the sleeve 20 and the shaft 40 and the thrust 70, and the oil gap is filled with oil having a predetermined viscosity. .

The oil in the oil gap generates dynamic pressure between the fixing member and the rotating member which is rotated against the surface thereof so that the shaft 40 can be stably driven.

However, the motor employing the fluid dynamic bearing of the above structure has the following problems.

In the case of a portable product such as a notebook, it is required to be lightweight and thin, and the motor employed therein is also required to be miniaturized. In this case, the journal bearing is formed between the inner diameter of the sleeve 20 and the outer diameter of the shaft 40. Its shorter length makes it vulnerable to conical vibrations.

In addition, in order to withstand a small impact on the characteristics of a portable product, the thickness of the thrust plate 70 should be secured to some extent. For example, in the case of a notebook motor equipped with a 2.5-inch platter, the overall height of the motor is 7.2 mm, so the thickness of the thrust plate 70 should be secured at least 1 mm, 1 mm compared with the length of the journal bearing. In other words, it takes a significant (non-negligible) weight.

However, when the thickness of the thrust plate 70 is designed to be 1 mm or more with the configuration of the motor as described above, the length of the journal bearing is shortened, which makes it vulnerable to conical vibration.

In addition, when the motor of the above configuration is subjected to an abnormal external shock, there is a problem that the oil leaks from the journal bearing adjacent to the outside air to contaminate the motor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a hydrodynamic bearing motor employing a truncated conical bearing whose structure is improved to effectively prevent conical vibration while miniaturizing the design. There is a purpose.

It is another object of the present invention to provide a hydrodynamic bearing motor employing a truncated conical bearing whose structure is improved so that it can be compactly and stably maintained against an external shock.

It is still another object of the present invention to provide a hydrodynamic bearing motor employing a truncated conical bearing which is improved to maintain a constant gap between the journal bearing parts and to improve driving characteristics of the motor.

It is still another object of the present invention to provide a hydrodynamic bearing motor employing a truncated cone bearing to effectively prevent the leakage of oil from the hydrodynamic bearing even when an external shock is applied to the motor or the housing containing the motor. .

1 is a cross-sectional view showing a conventional hydrodynamic bearing motor,

2 is a cross-sectional view showing a hydrodynamic bearing motor of an embodiment of the present invention;

3 is an excerpt of the main portion of FIG.

Figure 4 is an extract showing the cone bearing of Figure 2,

5 is a cross-sectional view of another embodiment of the fluid hydrodynamic bearing motor of the present invention;

6 is a cross-sectional view of another embodiment of the present invention, a hydrodynamic bearing motor;

7 is a schematic separation view for explaining the motor of FIG. 6;

8 is an excerpt of the main portion of FIG. 6,

9 is a cross-sectional view of yet another embodiment of the fluid hydrodynamic bearing motor of the present invention;

10 is a cross-sectional view showing yet another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

110 ... Housing 111 ... Combination rib

120 ... sleeve 121 ...

122 ... (Sleeve) Vertical Inner Mirror 130 ... Herb

140.Shaft 141 ... Flange

150 ... hub 160 ... magnet

180 ... cover plate 190 ... cover block

191 ... Frustrated cone outer surface (in cover block)

In the present invention to achieve the above object, in a hydrodynamic bearing motor having a fixing member and a rotating member which is rotationally supported by the bearing supporting means by the fluid dynamic pressure,

The bearing supporting means is characterized in that the truncated conical bearing for supporting the rotating member at the same time in a direction perpendicular to the rotation axis and the rotation axis with respect to the fixed member.

In the fluid hydrodynamic bearing motor of the present invention, the fixing member has a coupling hole formed at a center thereof, and a coupling rib is formed concentrically with the coupling hole, the housing having a core provided on an outer circumferential surface of the coupling rib; A coupling fixed to the coupling hole and a through hole formed at a center thereof, an upper side of the through hole having a truncated conical inner diameter surface formed at a middle side thereof, and a vertical inner diameter surface formed at a lower side thereof; A cover plate coupled to the lower end of the through hole of the sleeve;

The rotating member may include a shaft rotatably coupled to the vertical inner diameter surface and having a flange at a lower end thereof rotatably coupled to the receiving groove; A cover block fixed to an upper end of the shaft and having a truncated cone outer diameter surface corresponding to the truncated cone inner diameter surface; A hub having a magnet attached to the cover block and rotating together with a magnet having a magnetic force generated by interaction with the core on an inner end surface of the extended end portion extending downward;

The truncated cone-shaped bearing is characterized in that formed between the truncated cone inner diameter surface and the truncated cone outer diameter surface through the oil or air. In addition, by processing fluid grooves in the truncated cone inner surface of the sleeve forming the conical bearing or the frustoconical outer surface of the cover block facing it, it is possible to not only improve dynamic pressure and prevent oil leakage but also release bubbles to the outside. Make sure

In addition, the truncated cone slope and the outer diameter surface of the lower shaft and the inner diameter surface of the sleeve form a journal bearing. At this time, by processing the fluid groove on the outer diameter surface of the shaft or the inner diameter surface of the sleeve facing the shaft to improve the dynamic pressure and prevent the leakage of oil as well as to release the bubbles to the outside.

In addition, the motor of the present invention is provided with an inclined inner surface extending upward from the upper end of the truncated cone inner surface at the upper end of the sleeve, the inner diameter is expanded, the oil leaks between the inclined inner surface and the outer peripheral surface of the cover block This staying space portion is formed.

In addition, the motor of the present invention is characterized in that the shaft and the cover block is integrally formed, the flange of the shaft is formed separated from the shaft.

In addition, the motor of the present invention is characterized in that the center of the magnet is positioned upward than the center of the core.

In addition, the hydrodynamic bearing motor of the present invention, the fixing member includes a housing having a coupling hole formed in the center; A sleeve having a lower end coupled to the coupling hole and provided with a core on an outer circumferential surface thereof, having a vertical inner diameter surface formed at a central portion thereof, and extending from a lower end portion of the vertical inner diameter surface to form an annular bottom surface; End fixed block is fixed to the lower end of the sleeve and the inner surface of the truncated cone-shaped on the upper surface;

The rotating member has a shaft having a truncated cone block whose upper side is rotatably coupled to the vertical inner diameter surface to form a journal bearing and a truncated cone outer diameter surface corresponding to the truncated cone inner diameter surface at a lower side thereof; A hub having a magnet having a central portion connected to the shaft and rotating together and generating an electromagnetic force by interaction with the core on an inner end surface of the extended end portion extending downward;

The truncated cone-shaped bearing is characterized in that formed between the truncated cone inner diameter surface and the truncated cone outer diameter surface through the oil or air. In addition, by processing the fluid groove in the truncated cone inner surface of the sleeve forming the conical bearing or the truncated cone outer surface of the shaft opposite to it to improve the dynamic pressure and prevent the leakage of oil as well as to release the bubble to the outside do.

In addition, the truncated cone slope and the outer diameter surface of the lower shaft and the inner diameter surface of the sleeve form a journal bearing. At this time, by processing the fluid groove on the outer diameter surface of the shaft or the inner diameter surface of the sleeve facing the shaft to improve the dynamic pressure and prevent the leakage of oil as well as to release the bubbles to the outside.

In the motor, a thrust bearing is formed between oil and air between the annular surface of the truncated cone block and the annular bottom surface of the sleeve.

In addition, in the motor of the present invention, an annular rib is formed on the bottom of the hub, an inclined outer diameter surface of which the upper end of the sleeve is accommodated inside the annular rib and inclined downward on the outer circumferential side thereof faces the inner surface of the sleeve. And at least one recess is formed on the upper surface of the sleeve opposite to the bottom surface of the annular rib to store the oil leaked from the truncated cone bearing.

The recesses are adjacent to each other and have opposite inclined surfaces, the first recesses extending from the lower end of the inclined outer surface, and the second recesses forming an oil reservoir by an annular jaw formed at the edge of the sleeve. It may be made of.

On the other hand, the truncated cone block and the body of the shaft may be formed to be separated and coupled to each other.

According to the above features of the present invention, the hydrodynamic bearing motor of the present invention employs a truncated conical bearing, which enables a reduced design while securing the length of the journal bearing, thereby suppressing conical vibration and miniaturizing it.

In addition, by employing a truncated cone-shaped bearing to increase the assembly area of the assembly portion, it is possible to maintain a stable assembly state against external impact, and to maintain a constant gap of the journal bearing portion to improve the driving characteristics of the motor.

In addition, by employing a space portion or a recess for storing the oil leaking from the bearing portion to prevent the external leakage of oil during external impact.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The hydrodynamic bearing motor of the present invention employs a truncated cone bearing which simultaneously accommodates a journal bearing and a thrust bearing, thereby enabling miniaturization of the motor, suppressing conical vibration, and enabling a stable structure against external shock.

Referring to Figures 2 to 4 showing one embodiment of the fluid dynamic bearing motor of the present invention, it is provided with a fixed member, and a rotating member which is rotated by the bearing support means by the fluid dynamic pressure relative to the fixed member, The bearing support means employs a truncated conical bearing which simultaneously supports the rotary member with respect to the fixed member in a direction perpendicular to the axis of rotation and the axis of rotation.

The fixing member includes a housing 110, a sleeve 120, and a cover plate 180.

The housing 110 has a coupling hole is formed in the center, the coupling rib 111 is formed concentrically with the coupling hole, the core 130 is provided on the outer peripheral surface of the coupling rib 111 is applied power for motor control. have.

The sleeve 120 is fixed to the coupling hole of the housing and the through hole is formed in the center, the upper side of the through hole is a truncated cone-shaped inner diameter surface 121 is formed in the middle side of the vertical inner diameter surface 122 is formed and has a structure in which a circular receiving groove 123 is formed at the lower side.

In addition, the cover plate 180 is fixed to the lower end of the through-hole of the sleeve 120, to prevent the departure of the shaft 140 to be described later.

On the other hand, the rotating member is composed of a shaft 140, the cover block 190 and the hub 150.

The shaft 140 has a structure in which a central portion thereof is rotatably coupled to the vertical inner diameter surface 122 and a flange 141 is rotatably coupled to the receiving groove 123 at a lower end thereof.

The cover block 190 is fixed to the upper end of the shaft 140 and has a structure in which a truncated cone outer diameter surface 191 corresponding to the truncated cone inner diameter surface 121 is formed.

The hub 150 is connected to the cover block 190 and its center is rotated together with a magnet 160 that generates an electromagnetic force by interacting with the core 130 on an extended inner end surface of the extended end. It is structured.

In the motor having the structure as described above, the truncated cone-shaped bearing 310 is formed through the oil between the truncated cone inner diameter surface 121 and the truncated cone outer diameter surface 191, referring to FIG. It adopts the bearing (journal bearing) and thrust bearing action at the same time.

That is, the load (F) of the rotating member is divided into the horizontal component (A) and the vertical component (B) in the cone bearing portion 310, the horizontal component is supported through the journal bearing, the vertical component through the thrust bearing Will be supported.

In addition, the hydrodynamic bearing motor of the embodiment of the present invention, referring to FIG. 3, the inclined inner diameter surface 124 extending upward from the top of the truncated conical inner diameter surface 121 of the sleeve 120 to expand the inner diameter thereof. And a space 195 in which oil leaks between the inclined inner diameter surface 124 and the outer circumferential surface of the cover block 190 is formed.

In the space 195, oil may leak from the conical bearing 310 due to centrifugal force when the motor rotates, and at this time, the lower portion of the space 195 adjacent to the conical bearing 310 is Since the width is narrower than the upper part, the collection of oil leaked by the capillary phenomenon is facilitated, and the return to the cone bearing portion 310 is possible.

In addition, due to the outer surface of the cone, the diameter of the shaft can be increased toward the upper side, thereby increasing the assembly area of the shaft and the hub, thereby improving shock resistance.

Referring to FIG. 5, which shows another embodiment of the hydrodynamic bearing motor of the present invention, in the embodiment of FIG. 2, the shaft 140 and the cover block 190 are integrally formed, and the flange of the shaft 140. 141 has a structure formed separately from the shaft 140.

The separated flange 141 is fixed to the shaft 140 by laser welding to be stable from external impact. Since the remaining components are the same as in the embodiment of FIG. 2, detailed description thereof will be omitted.

In this embodiment, the motor, the shaft 190 having a conical inclined surface is enlarged toward the upper side, thereby allowing the area of the assembly portion of the hub 150 and the shaft 190 to be enlarged to the outside It has a structure stable to impact.

On the other hand, since the conical bearing can only support the rotating member upwards, a force for pulling the rotating member downward is required. An embodiment for this is shown in FIGS. 2 and 5. This is designed such that the center of the magnet 160 is located upward rather than the center of the core 130. That is, referring to FIG. 2, the center of the core 130 and the center of the magnet 160 have a mutual gap D.

In this case, by moving the rotating member including the magnet 160 downward by the electromagnetic force with respect to the fixing member including the core 130 to prevent the separation of the rotating member and to enable a stable rotation.

The operation of the hydrodynamic bearing motor of the embodiment of FIGS. 2 and 5 is as follows.

When the current according to the motor control signal is applied to the core 130, the shaft 140, the cover block 190 and the hub 150 is rotated by the electromagnetic force with the magnet 160.

At this time, according to the distance (D) deviation between the center of the magnet 160 and the hub 130, the rotating members including the hub 150 has an electromagnetic force in the downward direction to enable a stable drive in the bearing parts.

In addition, a journal bearing 320 is formed between the vertical inner diameter surface 122 of the sleeve 120 and the outer diameter surface of the shaft 140, and the truncated cone inner diameter surface 121 of the sleeve 120 and the cover block ( Conical bearing 310 is formed between the outer cone surface 191 of the truncated cone of 191, so that the size of the journal bearing portion is not reduced while miniaturizing the motor, thereby greatly preventing the occurrence of conical vibration.

In addition, when oil leaks through the frusto-conical bearing 310 adjacent to the outside air, the formation of the space portion 195 prevents the oil from scattering and enables the collection to return to the bearing portion.

On the other hand, by the downward electromagnetic force and the flange 141 of the shaft 140 according to the gap (D) difference while the motor is driven, to prevent the upward departure of the rotating members.

In addition, by employing a truncated cone bearing 310, by assembling the hub 150 and the cover block 190 to increase the assembly area it is possible to maintain a stable assembly state against the external impact.

In addition, by employing the truncated cone bearing 310, the gap between the journal bearing portion 320 is kept constant to improve the driving characteristics of the motor.

6 to 8 showing another embodiment of the fluid dynamic bearing motor of the present invention, which is a rotating member which is rotatably supported by a fixed member and a truncated cone bearing by fluid dynamic pressure with respect to the fixed member as in the above embodiment. It is provided.

The fixing member is composed of a housing 410, the sleeve 420 and the end fixing block 480, the coupling hole is formed in the center.

The sleeve 420 has a lower end coupled to the coupling hole and a core 130 is provided on an outer circumferential surface thereof, and a vertical inner diameter surface 421 is formed at a central portion thereof, and an annular bottom is extended from a lower end portion of the vertical inner diameter surface 421. It has a structure in which the surface 422 is formed.

The end fixing block 480 is fixedly coupled to the lower end of the sleeve 420 and has a structure in which an inner diameter surface 481 of a truncated cone shape is formed on an upper surface thereof.

The rotating member is composed of a shaft 440 and the hub 450.

The shaft 440 may be rotatably coupled to the vertical inner diameter surface 421 to form a journal bearing, and may form a fluid groove in the outer diameter surface of the shaft or the inner diameter surface of the sleeve to improve dynamic pressure. .

A truncated cone block 441 having a truncated cone outer diameter surface 442 corresponding to the truncated cone inner surface 481 is provided below the shaft.

The hub 450 is rotated together with its central portion connected to the shaft 440, and a magnet 160 for generating an electromagnetic force by interaction with the core 130 is attached to the inner end surface of the extended end portion extending downward. have.

The truncated cone-shaped bearing is formed between the truncated cone inner diameter surface 481 and the truncated cone outer diameter surface 442 via an oil, and simultaneously employs a journal bearing and a thrust bearing action.

6 and 7, a thrust bearing is formed between the annular surface 443 of the truncated cone block 441 and the annular bottom surface 422 of the sleeve 420. do. A fluid groove is formed in either the annular bottom of the sleeve or the annular surface of the truncated cone block to improve dynamic pressure and prevent oil leakage.

In addition, an annular rib 451 is formed at the bottom of the central portion of the hub 450, and an upper end portion of the sleeve 420 is accommodated inside the annular rib 451, and is inclined downward to the outer circumferential side thereof. An inclined outer diameter surface 423 faces the inner surface 452 of the sleeve 420.

In addition, a recess is formed in an upper surface of the sleeve 420 opposite to the bottom surface 453 of the annular rib 451 to store oil leaked from the journal bearing portion.

The recesses are adjacent to each other and have opposite inclined surfaces, the first recesses 424 extending from the lower end of the inclined outer diameter surface 423, and the annular jaw formed at the edge of the sleeve 420. And a second recess 425 which forms an oil reservoir by 426.

9 shows another embodiment of the fluid dynamic bearing motor of the present invention, and is a modification of the embodiment of FIG.

This is because the truncated cone block 441 and the body of the shaft 440 are formed to be separated and coupled to each other, so that the processing of the truncated cone block 441 is unfolded.

The operation of the hydrodynamic bearing motor of the embodiment of FIG. 6 and FIG. 9 is as follows.

When a current according to the motor control signal is applied to the core 430, the shaft 440 and the hub 450 is rotated by the electromagnetic force with the magnet 460.

At this time, a journal bearing is formed between the vertical inner diameter surface 421 of the sleeve 420 and the outer diameter surface of the shaft 440, and the inner diameter surface 481 and the truncated cone block 441 of the end fixed block 480. Conical bearings are formed between the outer cone surface 442 of the truncated cone.

In addition, the oil is interposed in the space between the annular bottom surface 422 of the sleeve 420 and the annular surface 443 of the truncated cone block 441, thereby forming a thrust bearing.

As described above, the formation of the journal bearing and the thrust bearing together with the formation of the conical bearing allows the motor to be miniaturized and the length of the journal bearing is not reduced, thereby greatly preventing the occurrence of conical vibration.

In addition, when the oil leaks during the external impact through the journal bearing adjacent to the outside air, oil leakage and scattering by forming the second stage oil reservoir by the formation of the first recess 424 and the second recess 425. Effectively prevents.

In addition, by employing a truncated cone bearing, the assembly area between the sleeve 420 and the end fixing block 480 can be increased to maintain a stable assembly state against external impact.

In addition, by employing a truncated cone bearing, the gap between the journal bearing portions is kept constant so that the driving characteristics of the motor can be improved.

On the other hand, referring to Figure 10 showing another embodiment of the present invention, the magnetic body 115 is fixedly coupled to the housing 110 opposite to the lower surface of the magnet 160, the rotating members are attracted downward This acts to maintain a stable rotation state.

The present invention as described above is not limited to the above embodiments without departing from the spirit and scope of the present application can be practiced with a number of modifications.

The present invention as described above has the following advantages.

First, by adopting the truncated conical bearing, the length of the journal bearing can be secured, and the motor can be reduced in size even though the motor is reduced in design.

Secondly, by employing a truncated cone bearing to increase the assembly area of the assembly, it is possible to maintain a stable assembly state against external shocks, and to maintain a constant gap of the journal bearing portion to improve the driving characteristics of the motor.

Third, by adopting a space portion or a recess for storing the oil leaking from the bearing portion to prevent the external leakage of oil during external impact.

Claims (11)

In a fluid dynamic bearing motor having a fixing member and a rotating member which is rotationally supported by a bearing supporting means by fluid dynamic pressure with respect to the fixing member, The bearing support means is a hydrodynamic bearing motor employing a truncated cone bearing, characterized in that the truncated conical bearing to simultaneously support the rotating member in the direction of the rotation axis and the right angle to the rotation axis with respect to the fixed member. The method of claim 1, The fixing member has a coupling hole is formed in the center, the coupling rib 111 is formed concentrically with the coupling hole, the housing 110 is provided with a core 130 on the outer peripheral surface of the coupling rib 111; The coupling hole is fixed to the coupling hole is formed in the center, the upper side of the through hole is a truncated conical inner diameter surface 121 is formed in the middle side is a vertical inner diameter surface 122 is formed in the lower side of the circular receiving groove 123 The formed sleeve 120 and; The cover plate 180 is coupled to the lower end of the through hole of the sleeve 120; The rotating member has a shaft 140 is rotatably coupled to the vertical inner diameter surface 122 and a flange 141 is rotatably coupled to the receiving groove 123 at the lower end; A cover block 190 fixed to an upper end of the shaft 140 and having a truncated cone outer diameter surface 191 corresponding to the truncated cone inner diameter surface 121; A hub 150 whose center is connected to the cover block 190 and rotated together with a magnet 160 that generates an electromagnetic force by interacting with the core 130 at an extended inner end surface of the extended end; , The truncated conical bearing 310 is a hydrodynamic bearing motor employing a truncated conical bearing, characterized in that formed between the truncated cone inner surface 121 and the truncated cone outer surface (191) via oil or air. The inclined inner surface 124 of claim 2, wherein the inclined inner surface 124 is extended to an upper end of the sleeve 120 and extends upward from an upper end of the truncated conical inner surface 121. A hydrodynamic bearing motor employing a truncated conical bearing, characterized in that a space portion (195) is formed between the inclined inner diameter surface (124) and the outer peripheral surface of the cover block (190). According to claim 2 or 3, wherein the shaft 140 and the cover block 190 is integrally formed, The flange 141 of the shaft 140 is a hydrodynamic bearing motor employing a truncated conical bearing, characterized in that formed separately from the shaft 140. 4. The hydrodynamic bearing motor according to claim 2 or 3, wherein the center of the magnet is positioned upward from the center of the core (130). The method of claim 1, The fixing member has a housing 410, the coupling hole is formed in the center; The lower end is fixed to the coupling hole and the core 130 is provided on the outer circumferential surface, a vertical inner diameter surface 421 is formed in the center and extended from the lower end of the vertical inner diameter surface 421 to form an annular bottom surface 422 A sleeve 420; End fixed block 480 is fixed to the lower end of the sleeve 420 and the inner surface 481 of the truncated cone shape is formed on the upper surface; The rotating member is a truncated cone having an upper side thereof rotatably coupled to the vertical inner diameter surface 421 to form a journal bearing and a truncated cone outer diameter surface 442 corresponding to the truncated cone inner diameter surface 481 at its lower side. A shaft 440 having a block 441; A hub 450 having a central portion thereof connected to the shaft 440 and having a magnet 160 attached thereto to generate an electromagnetic force by interacting with the core 130 at an inner end surface of the extended end portion extending downward; The truncated cone bearing is a hydrodynamic bearing motor employing a truncated cone bearing, characterized in that formed between the truncated cone inner surface (481) and the truncated cone outer surface (442) via oil or air. 7. The thrust bearing according to claim 6, wherein thrust bearings are formed between the annular surface 443 of the truncated cone block 441 and the annular bottom surface 422 of the sleeve 420 with oil or air interposed therebetween. Fluid dynamic bearing motor with cone bearing. The method of claim 6 or 7, wherein the annular rib 451 is formed on the bottom of the hub 450, An upper end portion of the sleeve 420 is accommodated inside the annular rib 451, and an inclined outer diameter surface 423 inclined downward on an outer circumferential side thereof is formed to face the inner surface 452 of the sleeve 420. , At least one recess is formed on an upper surface of the sleeve 420 opposite to the bottom surface 453 of the annular rib 451 to store oil leaking from the journal bearing portion Hydrodynamic bearing motors with conical bearings. 9. The recess of claim 8, wherein the recesses are adjacent to each other and have opposite inclined surfaces, the first recesses 424 extending from the lower end of the inclined outer diameter surface 423, and the edge of the sleeve 420. A hydrodynamic bearing motor employing a frusto-conical bearing, characterized in that it consists of a second recess (425) for forming an oil reservoir by an annular jaw (426) formed therein. The fluid hydrodynamic bearing motor according to claim 6 or 7, wherein the truncated cone block (441) and the body of the shaft (440) are separately formed so as to be mutually coupled and separated. 8. A hydrodynamic bearing motor according to any one of claims 2, 3, 6 and 7, wherein a magnetic body is fixedly coupled to the housing facing the lower surface of the magnet.